src/surf/cpu_ti.c

   1
   2 /* Copyright (c) 2009, 2010. The SimGrid Team.
   3  * All rights reserved.                                                     */
   4
   5 /* This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the license (GNU LGPL) which comes with this package. */
   7
   8 /*
   9   commit: e2d6799c4182f00443b3013aadb1c2412372460f
  10   This commit retrieves the old implementation of CPU_TI with multi-levels.
  11 */
  12
  13 #include "surf_private.h"
  14 #include "trace_mgr_private.h"
  15 #include "cpu_ti_private.h"
  16 #include "xbt/heap.h"
  17 #include "surf/surf_resource.h"
  18
  19 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_cpu_ti, surf,
  20                                 "Logging specific to the SURF CPU TRACE INTEGRATION module");
  21
  22
  23 static xbt_swag_t
  24     cpu_ti_running_action_set_that_does_not_need_being_checked = NULL;
  25 static xbt_swag_t cpu_ti_modified_cpu = NULL;
  26 static xbt_heap_t cpu_ti_action_heap;
  27
  28 /* prototypes of new trace functions */
  29 static double surf_cpu_ti_integrate_trace(surf_cpu_ti_tgmr_t trace,
  30                                           double a, double b);
  31
  32
  33 static double surf_cpu_ti_solve_trace(surf_cpu_ti_tgmr_t trace, double a,
  34                                       double amount);
  35 static double surf_cpu_ti_solve_trace_somewhat_simple(surf_cpu_ti_tgmr_t
  36                                                       trace, double a,
  37                                                       double amount);
  38
  39 static void surf_cpu_ti_free_tmgr(surf_cpu_ti_tgmr_t trace);
  40
  41 static double surf_cpu_ti_integrate_trace_simple(surf_cpu_ti_trace_t trace,
  42                                                  double a, double b);
  43 static double surf_cpu_ti_integrate_trace_simple_point(surf_cpu_ti_trace_t
  44                                                        trace, double a);
  45 static double surf_cpu_ti_solve_trace_simple(surf_cpu_ti_trace_t trace,
  46                                              double a, double amount);
  47 static int surf_cpu_ti_binary_search(double *array, double a, int low,
  48                                      int high);
  49 /* end prototypes */
  50
  51 static void surf_cpu_ti_free_trace(surf_cpu_ti_trace_t trace)
  52 {
  53   xbt_free(trace->time_points);
  54   xbt_free(trace->integral);
  55   xbt_free(trace);
  56 }
  57
  58 static void surf_cpu_ti_free_tmgr(surf_cpu_ti_tgmr_t trace)
  59 {
  60   if (trace->trace)
  61     surf_cpu_ti_free_trace(trace->trace);
  62   xbt_free(trace);
  63 }
  64
  65 static surf_cpu_ti_trace_t surf_cpu_ti_trace_new(tmgr_trace_t power_trace)
  66 {
  67   surf_cpu_ti_trace_t trace;
  68   s_tmgr_event_t val;
  69   unsigned int cpt;
  70   double integral = 0;
  71   double time = 0;
  72   int i = 0;
  73   trace = xbt_new0(s_surf_cpu_ti_trace_t, 1);
  74   trace->time_points =
  75       xbt_malloc0(sizeof(double) *
  76                   (xbt_dynar_length(power_trace->s_list.event_list) + 1));
  77   trace->integral =
  78       xbt_malloc0(sizeof(double) *
  79                   (xbt_dynar_length(power_trace->s_list.event_list) + 1));
  80   trace->nb_points = xbt_dynar_length(power_trace->s_list.event_list);
  81   xbt_dynar_foreach(power_trace->s_list.event_list, cpt, val) {
  82     trace->time_points[i] = time;
  83     trace->integral[i] = integral;
  84     integral += val.delta * val.value;
  85     time += val.delta;
  86     i++;
  87   }
  88   trace->time_points[i] = time;
  89   trace->integral[i] = integral;
  90   return trace;
  91 }
  92
  93 /**
  94 * \brief Creates a new integration trace from a tmgr_trace_t
  95 *
  96 * \param  power_trace    CPU availability trace
  97 * \param  value          Percentage of CPU power available (useful to fixed tracing)
  98 * \param  spacing        Initial spacing
  99 * \return  Integration trace structure
 100 */
 101 static surf_cpu_ti_tgmr_t cpu_ti_parse_trace(tmgr_trace_t power_trace,
 102                                              double value)
 103 {
 104   surf_cpu_ti_tgmr_t trace;
 105   double total_time = 0.0;
 106   s_tmgr_event_t val;
 107   unsigned int cpt;
 108   trace = xbt_new0(s_surf_cpu_ti_tgmr_t, 1);
 109
 110 /* no availability file, fixed trace */
 111   if (!power_trace) {
 112     trace->type = TRACE_FIXED;
 113     trace->value = value;
 114     XBT_DEBUG("No availabily trace. Constant value = %lf", value);
 115     return trace;
 116   }
 117
 118   /* only one point available, fixed trace */
 119   if (xbt_dynar_length(power_trace->s_list.event_list) == 1) {
 120     xbt_dynar_get_cpy(power_trace->s_list.event_list, 0, &val);
 121     trace->type = TRACE_FIXED;
 122     trace->value = val.value;
 123     return trace;
 124   }
 125
 126   trace->type = TRACE_DYNAMIC;
 127   trace->power_trace = power_trace;
 128
 129   /* count the total time of trace file */
 130   xbt_dynar_foreach(power_trace->s_list.event_list, cpt, val) {
 131     total_time += val.delta;
 132   }
 133   trace->trace = surf_cpu_ti_trace_new(power_trace);
 134   trace->last_time = total_time;
 135   trace->total =
 136       surf_cpu_ti_integrate_trace_simple(trace->trace, 0, total_time);
 137
 138   XBT_DEBUG("Total integral %lf, last_time %lf ",
 139          trace->total, trace->last_time);
 140
 141   return trace;
 142 }
 143
 144
 145 static void* cpu_ti_create_resource(const char *name, double power_peak,
 146                            double power_scale,
 147                            tmgr_trace_t power_trace,
 148                            int core,
 149                            e_surf_resource_state_t state_initial,
 150                            tmgr_trace_t state_trace,
 151                            xbt_dict_t cpu_properties)
 152 {
 153   tmgr_trace_t empty_trace;
 154   s_tmgr_event_t val;
 155   cpu_ti_t cpu = NULL;
 156   s_surf_action_cpu_ti_t ti_action;
 157   xbt_assert(core==1,"Multi-core not handled with this model yet");
 158   xbt_assert(!surf_cpu_resource_by_name(name),
 159               "Host '%s' declared several times in the platform file",
 160               name);
 161   xbt_assert(core==1,"Multi-core not handled with this model yet");
 162   cpu = (cpu_ti_t) surf_resource_new(sizeof(s_cpu_ti_t),
 163           surf_cpu_model, name,cpu_properties);
 164   cpu->action_set =
 165       xbt_swag_new(xbt_swag_offset(ti_action, cpu_list_hookup));
 166   cpu->power_peak = power_peak;
 167   xbt_assert(cpu->power_peak > 0, "Power has to be >0");
 168   XBT_DEBUG("power scale %lf", power_scale);
 169   cpu->power_scale = power_scale;
 170   cpu->avail_trace = cpu_ti_parse_trace(power_trace, power_scale);
 171   cpu->state_current = state_initial;
 172   if (state_trace)
 173     cpu->state_event =
 174         tmgr_history_add_trace(history, state_trace, 0.0, 0, cpu);
 175   if (power_trace && xbt_dynar_length(power_trace->s_list.event_list) > 1) {
 176     /* add a fake trace event if periodicity == 0 */
 177     xbt_dynar_get_cpy(power_trace->s_list.event_list,
 178                       xbt_dynar_length(power_trace->s_list.event_list) - 1, &val);
 179     if (val.delta == 0) {
 180       empty_trace = tmgr_empty_trace_new();
 181       cpu->power_event =
 182           tmgr_history_add_trace(history, empty_trace,
 183                                  cpu->avail_trace->last_time, 0, cpu);
 184     }
 185   }
 186   xbt_lib_set(host_lib, name, SURF_CPU_LEVEL, cpu);
 187
 188   return cpu;
 189 }
 190
 191
 192 static void parse_cpu_ti_init(sg_platf_host_cbarg_t host)
 193 {
 194   cpu_ti_create_resource(host->id,
 195         host->power_peak,
 196         host->power_scale,
 197         host->power_trace,
 198         host->core_amount,
 199         host->initial_state,
 200         host->state_trace,
 201         host->properties);
 202
 203 }
 204
 205 static void add_traces_cpu_ti(void)
 206 {
 207   xbt_dict_cursor_t cursor = NULL;
 208   char *trace_name, *elm;
 209
 210   static int called = 0;
 211
 212   if (called)
 213     return;
 214   called = 1;
 215
 216 /* connect all traces relative to hosts */
 217   xbt_dict_foreach(trace_connect_list_host_avail, cursor, trace_name, elm) {
 218     tmgr_trace_t trace = xbt_dict_get_or_null(traces_set_list, trace_name);
 219     cpu_ti_t cpu = surf_cpu_resource_by_name(elm);
 220
 221     xbt_assert(cpu, "Host %s undefined", elm);
 222     xbt_assert(trace, "Trace %s undefined", trace_name);
 223
 224     if (cpu->state_event) {
 225       XBT_DEBUG("Trace already configured for this CPU(%s), ignoring it",
 226              elm);
 227       continue;
 228     }
 229     XBT_DEBUG("Add state trace: %s to CPU(%s)", trace_name, elm);
 230     cpu->state_event = tmgr_history_add_trace(history, trace, 0.0, 0, cpu);
 231   }
 232
 233   xbt_dict_foreach(trace_connect_list_power, cursor, trace_name, elm) {
 234     tmgr_trace_t trace = xbt_dict_get_or_null(traces_set_list, trace_name);
 235     cpu_ti_t cpu = surf_cpu_resource_by_name(elm);
 236
 237     xbt_assert(cpu, "Host %s undefined", elm);
 238     xbt_assert(trace, "Trace %s undefined", trace_name);
 239
 240     XBT_DEBUG("Add power trace: %s to CPU(%s)", trace_name, elm);
 241     if (cpu->avail_trace)
 242       surf_cpu_ti_free_tmgr(cpu->avail_trace);
 243
 244     cpu->avail_trace = cpu_ti_parse_trace(trace, cpu->power_scale);
 245
 246     /* add a fake trace event if periodicity == 0 */
 247     if (trace && xbt_dynar_length(trace->s_list.event_list) > 1) {
 248       s_tmgr_event_t val;
 249       xbt_dynar_get_cpy(trace->s_list.event_list,
 250                         xbt_dynar_length(trace->s_list.event_list) - 1, &val);
 251       if (val.delta == 0) {
 252         tmgr_trace_t empty_trace;
 253         empty_trace = tmgr_empty_trace_new();
 254         cpu->power_event =
 255             tmgr_history_add_trace(history, empty_trace,
 256                                    cpu->avail_trace->last_time, 0, cpu);
 257       }
 258     }
 259   }
 260 }
 261
 262 static void cpu_ti_define_callbacks()
 263 {
 264   sg_platf_host_add_cb(parse_cpu_ti_init);
 265   sg_platf_postparse_add_cb(add_traces_cpu_ti);
 266 }
 267
 268 static int cpu_ti_resource_used(void *resource_id)
 269 {
 270   cpu_ti_t cpu = resource_id;
 271   return xbt_swag_size(cpu->action_set);
 272 }
 273
 274 static int cpu_ti_action_unref(surf_action_t action)
 275 {
 276   action->refcount--;
 277   if (!action->refcount) {
 278     xbt_swag_remove(action, action->state_set);
 279     /* remove from action_set */
 280     xbt_swag_remove(action, ACTION_GET_CPU(action)->action_set);
 281     /* remove from heap */
 282     xbt_heap_remove(cpu_ti_action_heap,
 283                     ((surf_action_cpu_ti_t) action)->index_heap);
 284     xbt_swag_insert(ACTION_GET_CPU(action), cpu_ti_modified_cpu);
 285     surf_action_free(&action);
 286     return 1;
 287   }
 288   return 0;
 289 }
 290
 291 static void cpu_ti_action_cancel(surf_action_t action)
 292 {
 293   surf_action_state_set(action, SURF_ACTION_FAILED);
 294   xbt_heap_remove(cpu_ti_action_heap,
 295                   ((surf_action_cpu_ti_t) action)->index_heap);
 296   xbt_swag_insert(ACTION_GET_CPU(action), cpu_ti_modified_cpu);
 297   return;
 298 }
 299
 300 static void cpu_ti_action_state_set(surf_action_t action,
 301                                     e_surf_action_state_t state)
 302 {
 303   surf_action_state_set(action, state);
 304   xbt_swag_insert(ACTION_GET_CPU(action), cpu_ti_modified_cpu);
 305   return;
 306 }
 307
 308 /**
 309 * \brief Update the remaining amount of actions
 310 *
 311 * \param  cpu    Cpu on which the actions are running
 312 * \param  now    Current time
 313 */
 314 static void cpu_ti_update_remaining_amount(cpu_ti_t cpu, double now)
 315 {
 316   double area_total;
 317   surf_action_cpu_ti_t action;
 318
 319 /* already updated */
 320   if (cpu->last_update >= now)
 321     return;
 322
 323 /* calcule the surface */
 324   area_total =
 325       surf_cpu_ti_integrate_trace(cpu->avail_trace, cpu->last_update,
 326                                   now) * cpu->power_peak;
 327   XBT_DEBUG("Flops total: %lf, Last update %lf", area_total,
 328          cpu->last_update);
 329
 330   xbt_swag_foreach(action, cpu->action_set) {
 331     surf_action_t generic = (surf_action_t)action;
 332     /* action not running, skip it */
 333     if (generic->state_set !=
 334         surf_cpu_model->states.running_action_set)
 335       continue;
 336
 337     /* bogus priority, skip it */
 338     if (generic->priority <= 0)
 339       continue;
 340
 341     /* action suspended, skip it */
 342     if (action->suspended != 0)
 343       continue;
 344
 345     /* action don't need update */
 346     if (generic->start >= now)
 347       continue;
 348
 349     /* skip action that are finishing now */
 350     if (generic->finish >= 0
 351         && generic->finish <= now)
 352       continue;
 353
 354     /* update remaining */
 355     double_update(&(generic->remains),
 356                   area_total / (cpu->sum_priority *
 357                                 generic->priority));
 358     XBT_DEBUG("Update remaining action(%p) remaining %lf", action,
 359            generic->remains);
 360   }
 361   cpu->last_update = now;
 362 #undef GENERIC_ACTION
 363 }
 364
 365 /**
 366 * \brief Update the finish date of action if necessary
 367 *
 368 * \param  cpu    Cpu on which the actions are running
 369 * \param  now    Current time
 370 */
 371 static void cpu_ti_update_action_finish_date(cpu_ti_t cpu, double now)
 372 {
 373 #define GENERIC_ACTION(action) action->generic_action
 374   surf_action_cpu_ti_t action;
 375   double sum_priority = 0.0, total_area, min_finish = -1;
 376
 377 /* update remaning amount of actions */
 378   cpu_ti_update_remaining_amount(cpu, now);
 379
 380   xbt_swag_foreach(action, cpu->action_set) {
 381     /* action not running, skip it */
 382     if (GENERIC_ACTION(action).state_set !=
 383         surf_cpu_model->states.running_action_set)
 384       continue;
 385
 386     /* bogus priority, skip it */
 387     if (GENERIC_ACTION(action).priority <= 0)
 388       continue;
 389
 390     /* action suspended, skip it */
 391     if (action->suspended != 0)
 392       continue;
 393
 394     sum_priority += 1.0 / GENERIC_ACTION(action).priority;
 395   }
 396   cpu->sum_priority = sum_priority;
 397
 398   xbt_swag_foreach(action, cpu->action_set) {
 399     min_finish = -1;
 400     /* action not running, skip it */
 401     if (GENERIC_ACTION(action).state_set !=
 402         surf_cpu_model->states.running_action_set)
 403       continue;
 404
 405     /* verify if the action is really running on cpu */
 406     if (action->suspended == 0 && GENERIC_ACTION(action).priority > 0) {
 407       /* total area needed to finish the action. Used in trace integration */
 408       total_area =
 409           (GENERIC_ACTION(action).remains) * sum_priority *
 410           GENERIC_ACTION(action).priority;
 411
 412       total_area /= cpu->power_peak;
 413
 414       GENERIC_ACTION(action).finish =
 415           surf_cpu_ti_solve_trace(cpu->avail_trace, now, total_area);
 416       /* verify which event will happen before (max_duration or finish time) */
 417       if ((GENERIC_ACTION(action).max_duration != NO_MAX_DURATION) &&
 418           (GENERIC_ACTION(action).start +
 419            GENERIC_ACTION(action).max_duration <
 420            GENERIC_ACTION(action).finish))
 421         min_finish = GENERIC_ACTION(action).start +
 422             GENERIC_ACTION(action).max_duration;
 423       else
 424         min_finish = GENERIC_ACTION(action).finish;
 425     } else {
 426       /* put the max duration time on heap */
 427       if (GENERIC_ACTION(action).max_duration != NO_MAX_DURATION)
 428         min_finish =
 429             (GENERIC_ACTION(action).start +
 430              GENERIC_ACTION(action).max_duration);
 431     }
 432     /* add in action heap */
 433     XBT_DEBUG("action(%p) index %d", action, action->index_heap);
 434     if (action->index_heap >= 0) {
 435       surf_action_cpu_ti_t heap_act =
 436           xbt_heap_remove(cpu_ti_action_heap, action->index_heap);
 437       if (heap_act != action)
 438         DIE_IMPOSSIBLE;
 439     }
 440     if (min_finish != NO_MAX_DURATION)
 441       xbt_heap_push(cpu_ti_action_heap, action, min_finish);
 442
 443     XBT_DEBUG
 444         ("Update finish time: Cpu(%s) Action: %p, Start Time: %lf Finish Time: %lf Max duration %lf",
 445          cpu->generic_resource.name, action, GENERIC_ACTION(action).start,
 446          GENERIC_ACTION(action).finish,
 447          GENERIC_ACTION(action).max_duration);
 448   }
 449 /* remove from modified cpu */
 450   xbt_swag_remove(cpu, cpu_ti_modified_cpu);
 451 #undef GENERIC_ACTION
 452 }
 453
 454 static double cpu_ti_share_resources(double now)
 455 {
 456   cpu_ti_t cpu, cpu_next;
 457   double min_action_duration = -1;
 458
 459 /* iterates over modified cpus to update share resources */
 460   xbt_swag_foreach_safe(cpu, cpu_next, cpu_ti_modified_cpu) {
 461     cpu_ti_update_action_finish_date(cpu, now);
 462   }
 463 /* get the min next event if heap not empty */
 464   if (xbt_heap_size(cpu_ti_action_heap) > 0)
 465     min_action_duration = xbt_heap_maxkey(cpu_ti_action_heap) - now;
 466
 467   XBT_DEBUG("Share resources, min next event date: %lf", min_action_duration);
 468
 469   return min_action_duration;
 470 }
 471
 472 static void cpu_ti_update_actions_state(double now, double delta)
 473 {
 474 #define GENERIC_ACTION(action) action->generic_action
 475   surf_action_cpu_ti_t action;
 476   while ((xbt_heap_size(cpu_ti_action_heap) > 0)
 477          && (xbt_heap_maxkey(cpu_ti_action_heap) <= now)) {
 478     action = xbt_heap_pop(cpu_ti_action_heap);
 479     XBT_DEBUG("Action %p: finish", action);
 480     GENERIC_ACTION(action).finish = surf_get_clock();
 481     /* set the remains to 0 due to precision problems when updating the remaining amount */
 482     GENERIC_ACTION(action).remains = 0;
 483     cpu_ti_action_state_set((surf_action_t) action, SURF_ACTION_DONE);
 484     /* update remaining amout of all actions */
 485     cpu_ti_update_remaining_amount(action->cpu, surf_get_clock());
 486   }
 487 #undef GENERIC_ACTION
 488 }
 489
 490 static void cpu_ti_update_resource_state(void *id,
 491                                          tmgr_trace_event_t event_type,
 492                                          double value, double date)
 493 {
 494   cpu_ti_t cpu = id;
 495   surf_action_cpu_ti_t action;
 496
 497   surf_watched_hosts();
 498
 499   if (event_type == cpu->power_event) {
 500     tmgr_trace_t power_trace;
 501     surf_cpu_ti_tgmr_t trace;
 502     s_tmgr_event_t val;
 503
 504     XBT_DEBUG("Finish trace date: %lf value %lf date %lf", surf_get_clock(),
 505            value, date);
 506     /* update remaining of actions and put in modified cpu swag */
 507     cpu_ti_update_remaining_amount(cpu, date);
 508     xbt_swag_insert(cpu, cpu_ti_modified_cpu);
 509
 510     power_trace = cpu->avail_trace->power_trace;
 511     xbt_dynar_get_cpy(power_trace->s_list.event_list,
 512                       xbt_dynar_length(power_trace->s_list.event_list) - 1, &val);
 513     /* free old trace */
 514     surf_cpu_ti_free_tmgr(cpu->avail_trace);
 515     cpu->power_scale = val.value;
 516
 517     trace = xbt_new0(s_surf_cpu_ti_tgmr_t, 1);
 518     trace->type = TRACE_FIXED;
 519     trace->value = val.value;
 520     XBT_DEBUG("value %lf", val.value);
 521
 522     cpu->avail_trace = trace;
 523
 524     if (tmgr_trace_event_free(event_type))
 525       cpu->power_event = NULL;
 526
 527   } else if (event_type == cpu->state_event) {
 528     if (value > 0)
 529       cpu->state_current = SURF_RESOURCE_ON;
 530     else {
 531       cpu->state_current = SURF_RESOURCE_OFF;
 532
 533       /* put all action running on cpu to failed */
 534       xbt_swag_foreach(action, cpu->action_set) {
 535         if (surf_action_state_get((surf_action_t) action) ==
 536             SURF_ACTION_RUNNING
 537             || surf_action_state_get((surf_action_t) action) ==
 538             SURF_ACTION_READY
 539             || surf_action_state_get((surf_action_t) action) ==
 540             SURF_ACTION_NOT_IN_THE_SYSTEM) {
 541           action->generic_action.finish = date;
 542           cpu_ti_action_state_set((surf_action_t) action,
 543                                   SURF_ACTION_FAILED);
 544           if (action->index_heap >= 0) {
 545             surf_action_cpu_ti_t heap_act =
 546                 xbt_heap_remove(cpu_ti_action_heap, action->index_heap);
 547             if (heap_act != action)
 548               DIE_IMPOSSIBLE;
 549           }
 550         }
 551       }
 552     }
 553     if (tmgr_trace_event_free(event_type))
 554       cpu->state_event = NULL;
 555   } else {
 556     XBT_CRITICAL("Unknown event ! \n");
 557     xbt_abort();
 558   }
 559
 560   return;
 561 }
 562
 563 static surf_action_t cpu_ti_execute(void *cpu, double size)
 564 {
 565   surf_action_cpu_ti_t action = NULL;
 566   cpu_ti_t CPU = cpu;
 567
 568   XBT_IN("(%s,%g)", surf_resource_name(CPU), size);
 569   action =
 570       surf_action_new(sizeof(s_surf_action_cpu_ti_t), size, surf_cpu_model,
 571                       CPU->state_current != SURF_RESOURCE_ON);
 572   action->cpu = cpu;
 573   action->index_heap = -1;
 574
 575   xbt_swag_insert(CPU, cpu_ti_modified_cpu);
 576
 577   xbt_swag_insert(action, CPU->action_set);
 578
 579   action->suspended = 0;        /* Should be useless because of the
 580                                    calloc but it seems to help valgrind... */
 581
 582   XBT_OUT();
 583   return (surf_action_t) action;
 584 }
 585
 586 static void cpu_ti_action_update_index_heap(void *action, int i)
 587 {
 588   ((surf_action_cpu_ti_t) action)->index_heap = i;
 589 }
 590
 591 static surf_action_t cpu_ti_action_sleep(void *cpu, double duration)
 592 {
 593   surf_action_cpu_ti_t action = NULL;
 594
 595   if (duration > 0)
 596     duration = MAX(duration, MAXMIN_PRECISION);
 597
 598   XBT_IN("(%s,%g)", surf_resource_name(cpu), duration);
 599   action = (surf_action_cpu_ti_t) cpu_ti_execute(cpu, 1.0);
 600   action->generic_action.max_duration = duration;
 601   action->suspended = 2;
 602   if (duration == NO_MAX_DURATION) {
 603     /* Move to the *end* of the corresponding action set. This convention
 604        is used to speed up update_resource_state  */
 605     xbt_swag_remove(action, ((surf_action_t) action)->state_set);
 606     ((surf_action_t) action)->state_set =
 607         cpu_ti_running_action_set_that_does_not_need_being_checked;
 608     xbt_swag_insert(action, ((surf_action_t) action)->state_set);
 609   }
 610   XBT_OUT();
 611   return (surf_action_t) action;
 612 }
 613
 614 static void cpu_ti_action_suspend(surf_action_t action)
 615 {
 616   XBT_IN("(%p)", action);
 617   if (((surf_action_cpu_ti_t) action)->suspended != 2) {
 618     ((surf_action_cpu_ti_t) action)->suspended = 1;
 619     xbt_heap_remove(cpu_ti_action_heap,
 620                     ((surf_action_cpu_ti_t) action)->index_heap);
 621     xbt_swag_insert(ACTION_GET_CPU(action), cpu_ti_modified_cpu);
 622   }
 623   XBT_OUT();
 624 }
 625
 626 static void cpu_ti_action_resume(surf_action_t action)
 627 {
 628   XBT_IN("(%p)", action);
 629   if (((surf_action_cpu_ti_t) action)->suspended != 2) {
 630     ((surf_action_cpu_ti_t) action)->suspended = 0;
 631     xbt_swag_insert(ACTION_GET_CPU(action), cpu_ti_modified_cpu);
 632   }
 633   XBT_OUT();
 634 }
 635
 636 static int cpu_ti_action_is_suspended(surf_action_t action)
 637 {
 638   return (((surf_action_cpu_ti_t) action)->suspended == 1);
 639 }
 640
 641 static void cpu_ti_action_set_max_duration(surf_action_t action,
 642                                            double duration)
 643 {
 644   surf_action_cpu_ti_t ACT = (surf_action_cpu_ti_t) action;
 645   double min_finish;
 646
 647   XBT_IN("(%p,%g)", action, duration);
 648
 649   action->max_duration = duration;
 650
 651   if (duration >= 0)
 652     min_finish =
 653         (action->start + action->max_duration) <
 654         action->finish ? (action->start +
 655                           action->max_duration) : action->finish;
 656   else
 657     min_finish = action->finish;
 658
 659 /* add in action heap */
 660   if (ACT->index_heap >= 0) {
 661     surf_action_cpu_ti_t heap_act =
 662         xbt_heap_remove(cpu_ti_action_heap, ACT->index_heap);
 663     if (heap_act != ACT)
 664       DIE_IMPOSSIBLE;
 665   }
 666   xbt_heap_push(cpu_ti_action_heap, ACT, min_finish);
 667
 668   XBT_OUT();
 669 }
 670
 671 static void cpu_ti_action_set_priority(surf_action_t action,
 672                                        double priority)
 673 {
 674   XBT_IN("(%p,%g)", action, priority);
 675   action->priority = priority;
 676   xbt_swag_insert(ACTION_GET_CPU(action), cpu_ti_modified_cpu);
 677   XBT_OUT();
 678 }
 679
 680 static double cpu_ti_action_get_remains(surf_action_t action)
 681 {
 682   XBT_IN("(%p)", action);
 683   cpu_ti_update_remaining_amount((cpu_ti_t)
 684                                  ((surf_action_cpu_ti_t) action)->cpu,
 685                                  surf_get_clock());
 686   XBT_OUT();
 687   return action->remains;
 688 }
 689
 690 static e_surf_resource_state_t cpu_ti_get_state(void *cpu)
 691 {
 692   return ((cpu_ti_t) cpu)->state_current;
 693 }
 694
 695 static double cpu_ti_get_speed(void *cpu, double load)
 696 {
 697   return load * (((cpu_ti_t) cpu)->power_peak);
 698 }
 699
 700 /**
 701 * \brief Auxiliary function to update the CPU power scale.
 702 *
 703 *  This function uses the trace structure to return the power scale at the determined time a.
 704 * \param trace    Trace structure to search the updated power scale
 705 * \param a        Time
 706 * \return CPU power scale
 707 */
 708 static double surf_cpu_ti_get_power_scale(surf_cpu_ti_tgmr_t trace,
 709                                           double a)
 710 {
 711   double reduced_a;
 712   int point;
 713   s_tmgr_event_t val;
 714
 715   reduced_a = a - floor(a / trace->last_time) * trace->last_time;
 716   point =
 717       surf_cpu_ti_binary_search(trace->trace->time_points, reduced_a, 0,
 718                                 trace->trace->nb_points - 1);
 719   xbt_dynar_get_cpy(trace->power_trace->s_list.event_list, point, &val);
 720   return val.value;
 721 }
 722
 723 static double cpu_ti_get_available_speed(void *cpu)
 724 {
 725   cpu_ti_t CPU = cpu;
 726   CPU->power_scale =
 727       surf_cpu_ti_get_power_scale(CPU->avail_trace, surf_get_clock());
 728 /* number between 0 and 1 */
 729   return CPU->power_scale;
 730 }
 731
 732 static void cpu_ti_finalize(void)
 733 {
 734   void **cpu;
 735   xbt_lib_cursor_t cursor;
 736   char *key;
 737
 738   xbt_lib_foreach(host_lib, cursor, key, cpu){
 739     if(cpu[SURF_CPU_LEVEL])
 740     {
 741         cpu_ti_t CPU = cpu[SURF_CPU_LEVEL];
 742         xbt_swag_free(CPU->action_set);
 743         surf_cpu_ti_free_tmgr(CPU->avail_trace);
 744     }
 745   }
 746
 747   surf_model_exit(surf_cpu_model);
 748   surf_cpu_model = NULL;
 749
 750   xbt_swag_free
 751       (cpu_ti_running_action_set_that_does_not_need_being_checked);
 752   xbt_swag_free(cpu_ti_modified_cpu);
 753   cpu_ti_running_action_set_that_does_not_need_being_checked = NULL;
 754   xbt_heap_free(cpu_ti_action_heap);
 755 }
 756
 757 static void surf_cpu_ti_model_init_internal(void)
 758 {
 759   s_surf_action_t action;
 760   s_cpu_ti_t cpu;
 761
 762   surf_cpu_model = surf_model_init();
 763
 764   cpu_ti_running_action_set_that_does_not_need_being_checked =
 765       xbt_swag_new(xbt_swag_offset(action, state_hookup));
 766
 767   cpu_ti_modified_cpu =
 768       xbt_swag_new(xbt_swag_offset(cpu, modified_cpu_hookup));
 769
 770   surf_cpu_model->name = "cpu_ti";
 771
 772   surf_cpu_model->action_unref = cpu_ti_action_unref;
 773   surf_cpu_model->action_cancel = cpu_ti_action_cancel;
 774   surf_cpu_model->action_state_set = cpu_ti_action_state_set;
 775
 776   surf_cpu_model->model_private->resource_used = cpu_ti_resource_used;
 777   surf_cpu_model->model_private->share_resources = cpu_ti_share_resources;
 778   surf_cpu_model->model_private->update_actions_state =
 779       cpu_ti_update_actions_state;
 780   surf_cpu_model->model_private->update_resource_state =
 781       cpu_ti_update_resource_state;
 782   surf_cpu_model->model_private->finalize = cpu_ti_finalize;
 783
 784   surf_cpu_model->suspend = cpu_ti_action_suspend;
 785   surf_cpu_model->resume = cpu_ti_action_resume;
 786   surf_cpu_model->is_suspended = cpu_ti_action_is_suspended;
 787   surf_cpu_model->set_max_duration = cpu_ti_action_set_max_duration;
 788   surf_cpu_model->set_priority = cpu_ti_action_set_priority;
 789   surf_cpu_model->get_remains = cpu_ti_action_get_remains;
 790
 791   surf_cpu_model->extension.cpu.execute = cpu_ti_execute;
 792   surf_cpu_model->extension.cpu.sleep = cpu_ti_action_sleep;
 793
 794   surf_cpu_model->extension.cpu.get_state = cpu_ti_get_state;
 795   surf_cpu_model->extension.cpu.get_speed = cpu_ti_get_speed;
 796   surf_cpu_model->extension.cpu.get_available_speed =
 797       cpu_ti_get_available_speed;
 798   surf_cpu_model->extension.cpu.create_resource = cpu_ti_create_resource;
 799   surf_cpu_model->extension.cpu.add_traces = add_traces_cpu_ti;
 800
 801   cpu_ti_action_heap = xbt_heap_new(8, NULL);
 802   xbt_heap_set_update_callback(cpu_ti_action_heap,
 803                                cpu_ti_action_update_index_heap);
 804
 805 }
 806
 807 void surf_cpu_model_init_ti()
 808 {
 809   xbt_assert(!surf_cpu_model,"CPU model already initialized. This should not happen.");
 810   surf_cpu_ti_model_init_internal();
 811   cpu_ti_define_callbacks();
 812   xbt_dynar_push(model_list, &surf_cpu_model);
 813 }
 814
 815
 816 /**
 817 * \brief Integrate trace
 818 *
 819 * Wrapper around surf_cpu_integrate_trace_simple() to get
 820 * the cyclic effect.
 821 *
 822 * \param trace Trace structure.
 823 * \param a      Begin of interval
 824 * \param b      End of interval
 825 * \return the integrate value. -1 if an error occurs.
 826 */
 827 static double surf_cpu_ti_integrate_trace(surf_cpu_ti_tgmr_t trace,
 828                                           double a, double b)
 829 {
 830   double first_chunk;
 831   double middle_chunk;
 832   double last_chunk;
 833   int a_index, b_index;
 834
 835   if ((a < 0.0) || (a > b)) {
 836     XBT_CRITICAL
 837         ("Error, invalid integration interval [%.2f,%.2f]. You probably have a task executing with negative computation amount. Check your code.",
 838          a, b);
 839     xbt_abort();
 840   }
 841   if (a == b)
 842     return 0.0;
 843
 844   if (trace->type == TRACE_FIXED) {
 845     return ((b - a) * trace->value);
 846   }
 847
 848   if (ceil(a / trace->last_time) == a / trace->last_time)
 849     a_index = 1 + (int) (ceil(a / trace->last_time));
 850   else
 851     a_index = (int) (ceil(a / trace->last_time));
 852
 853   b_index = (int) (floor(b / trace->last_time));
 854
 855   if (a_index > b_index) {      /* Same chunk */
 856     return surf_cpu_ti_integrate_trace_simple(trace->trace,
 857                                               a - (a_index -
 858                                                    1) * trace->last_time,
 859                                               b -
 860                                               (b_index) *
 861                                               trace->last_time);
 862   }
 863
 864   first_chunk = surf_cpu_ti_integrate_trace_simple(trace->trace,
 865                                                    a - (a_index -
 866                                                         1) *
 867                                                    trace->last_time,
 868                                                    trace->last_time);
 869   middle_chunk = (b_index - a_index) * trace->total;
 870   last_chunk = surf_cpu_ti_integrate_trace_simple(trace->trace,
 871                                                   0.0,
 872                                                   b -
 873                                                   (b_index) *
 874                                                   trace->last_time);
 875
 876   XBT_DEBUG("first_chunk=%.2f  middle_chunk=%.2f  last_chunk=%.2f\n",
 877          first_chunk, middle_chunk, last_chunk);
 878
 879   return (first_chunk + middle_chunk + last_chunk);
 880 }
 881
 882 /**
 883  * \brief Auxiliary function to calculate the integral between a and b.
 884  *     It simply calculates the integral at point a and b and returns the difference
 885  *   between them.
 886  * \param trace    Trace structure
 887  * \param a        Initial point
 888  * \param b  Final point
 889  * \return  Integral
 890 */
 891 static double surf_cpu_ti_integrate_trace_simple(surf_cpu_ti_trace_t trace,
 892                                                  double a, double b)
 893 {
 894   return surf_cpu_ti_integrate_trace_simple_point(trace,
 895                                                   b) -
 896       surf_cpu_ti_integrate_trace_simple_point(trace, a);
 897 }
 898
 899 /**
 900  * \brief Auxiliary function to calculate the integral at point a.
 901  * \param trace    Trace structure
 902  * \param a        point
 903  * \return  Integral
 904 */
 905 static double surf_cpu_ti_integrate_trace_simple_point(surf_cpu_ti_trace_t
 906                                                        trace, double a)
 907 {
 908   double integral = 0;
 909   int ind;
 910   double a_aux = a;
 911   ind =
 912       surf_cpu_ti_binary_search(trace->time_points, a, 0,
 913                                 trace->nb_points - 1);
 914   integral += trace->integral[ind];
 915   XBT_DEBUG
 916       ("a %lf ind %d integral %lf ind + 1 %lf ind %lf time +1 %lf time %lf",
 917        a, ind, integral, trace->integral[ind + 1], trace->integral[ind],
 918        trace->time_points[ind + 1], trace->time_points[ind]);
 919   double_update(&a_aux, trace->time_points[ind]);
 920   if (a_aux > 0)
 921     integral +=
 922         ((trace->integral[ind + 1] -
 923           trace->integral[ind]) / (trace->time_points[ind + 1] -
 924                                    trace->time_points[ind])) * (a -
 925                                                                 trace->
 926                                                                 time_points
 927                                                                 [ind]);
 928   XBT_DEBUG("Integral a %lf = %lf", a, integral);
 929
 930   return integral;
 931 }
 932
 933 /**
 934 * \brief Calculate the time needed to execute "amount" on cpu.
 935 *
 936 * Here, amount can span multiple trace periods
 937 *
 938 * \param trace   CPU trace structure
 939 * \param a        Initial time
 940 * \param amount  Amount to be executed
 941 * \return  End time
 942 */
 943 static double surf_cpu_ti_solve_trace(surf_cpu_ti_tgmr_t trace, double a,
 944                                       double amount)
 945 {
 946   int quotient;
 947   double reduced_b;
 948   double reduced_amount;
 949   double reduced_a;
 950   double b;
 951
 952 /* Fix very small negative numbers */
 953   if ((a < 0.0) && (a > -EPSILON)) {
 954     a = 0.0;
 955   }
 956   if ((amount < 0.0) && (amount > -EPSILON)) {
 957     amount = 0.0;
 958   }
 959
 960 /* Sanity checks */
 961   if ((a < 0.0) || (amount < 0.0)) {
 962     XBT_CRITICAL
 963         ("Error, invalid parameters [a = %.2f, amount = %.2f]. You probably have a task executing with negative computation amount. Check your code.",
 964          a, amount);
 965     xbt_abort();
 966   }
 967
 968 /* At this point, a and amount are positive */
 969
 970   if (amount < EPSILON)
 971     return a;
 972
 973 /* Is the trace fixed ? */
 974   if (trace->type == TRACE_FIXED) {
 975     return (a + (amount / trace->value));
 976   }
 977
 978   XBT_DEBUG("amount %lf total %lf", amount, trace->total);
 979 /* Reduce the problem to one where amount <= trace_total */
 980   quotient = (int) (floor(amount / trace->total));
 981   reduced_amount = (trace->total) * ((amount / trace->total) -
 982                                      floor(amount / trace->total));
 983   reduced_a = a - (trace->last_time) * (int) (floor(a / trace->last_time));
 984
 985   XBT_DEBUG("Quotient: %d reduced_amount: %lf reduced_a: %lf", quotient,
 986          reduced_amount, reduced_a);
 987
 988 /* Now solve for new_amount which is <= trace_total */
 989 /*
 990    fprintf(stderr,"reduced_a = %.2f\n",reduced_a);
 991    fprintf(stderr,"reduced_amount = %.2f\n",reduced_amount);
 992  */
 993   reduced_b =
 994       surf_cpu_ti_solve_trace_somewhat_simple(trace, reduced_a,
 995                                               reduced_amount);
 996
 997 /* Re-map to the original b and amount */
 998   b = (trace->last_time) * (int) (floor(a / trace->last_time)) +
 999       (quotient * trace->last_time) + reduced_b;
1000   return b;
1001 }
1002
1003 /**
1004 * \brief Auxiliary function to solve integral
1005 *
1006 * Here, amount is <= trace->total
1007 * and a <=trace->last_time
1008 *
1009 */
1010 static double surf_cpu_ti_solve_trace_somewhat_simple(surf_cpu_ti_tgmr_t
1011                                                       trace, double a,
1012                                                       double amount)
1013 {
1014   double amount_till_end;
1015   double b;
1016
1017   XBT_DEBUG("Solve integral: [%.2f, amount=%.2f]", a, amount);
1018   amount_till_end =
1019       surf_cpu_ti_integrate_trace(trace, a, trace->last_time);
1020 /*
1021    fprintf(stderr,"amount_till_end=%.2f\n",amount_till_end);
1022  */
1023
1024   if (amount_till_end > amount) {
1025     b = surf_cpu_ti_solve_trace_simple(trace->trace, a, amount);
1026   } else {
1027     b = trace->last_time +
1028         surf_cpu_ti_solve_trace_simple(trace->trace, 0.0,
1029                                        amount - amount_till_end);
1030   }
1031   return b;
1032 }
1033
1034 /**
1035  * \brief Auxiliary function to solve integral.
1036  *  It returns the date when the requested amount of flops is available
1037  * \param trace    Trace structure
1038  * \param a        Initial point
1039  * \param amount  Amount of flops
1040  * \return The date when amount is available.
1041 */
1042 static double surf_cpu_ti_solve_trace_simple(surf_cpu_ti_trace_t trace,
1043                                              double a, double amount)
1044 {
1045   double integral_a;
1046   int ind;
1047   double time;
1048   integral_a = surf_cpu_ti_integrate_trace_simple_point(trace, a);
1049   ind =
1050       surf_cpu_ti_binary_search(trace->integral, integral_a + amount, 0,
1051                                 trace->nb_points - 1);
1052   time = trace->time_points[ind];
1053   time +=
1054       (integral_a + amount -
1055        trace->integral[ind]) / ((trace->integral[ind + 1] -
1056                                  trace->integral[ind]) /
1057                                 (trace->time_points[ind + 1] -
1058                                  trace->time_points[ind]));
1059
1060   return time;
1061 }
1062
1063 /**
1064  * \brief Binary search in array.
1065  *  It returns the first point of the interval in which "a" is.
1066  * \param array    Array
1067  * \param a        Value to search
1068  * \param low     Low bound to search in array
1069  * \param high    Upper bound to search in array
1070  * \return Index of point
1071 */
1072 static int surf_cpu_ti_binary_search(double *array, double a, int low,
1073                                      int high)
1074 {
1075   xbt_assert(low < high, "Wrong parameters: low (%d) should be smaller than"
1076       " high (%d)", low, high);
1077
1078   int mid;
1079   do {
1080     mid = low + (high - low) / 2;
1081     XBT_DEBUG("a %lf low %d high %d mid %d value %lf", a, low, high, mid,
1082         array[mid]);
1083
1084     if (array[mid] > a)
1085       high = mid;
1086     else
1087       low = mid;
1088   }
1089   while (low < high - 1);
1090
1091   return low;
1092 }